Electron 6, dependency upgrade.

.travis.yml

@@ -13,6 +13,7 @@ matrix:
     - os: linux
       services: docker
       language: generic
+      node_js: "12"
       env:
         - ELECTRON_BUILDER_ALLOW_UNRESOLVED_DEPENDENCIES=true
 

package.json

@@ -35,15 +35,15 @@
     "github-syntax-dark": "^0.5.0",
     "jquery": "^3.4.1",
     "request": "^2.88.0",
-    "semver": "^6.2.0",
+    "semver": "^6.3.0",
     "tar-fs": "^2.0.0",
     "winreg": "^1.2.4"
   },
   "devDependencies": {
     "cross-env": "^5.2.0",
-    "electron": "^5.0.6",
-    "electron-builder": "^21.0.15",
-    "eslint": "^6.0.1"
+    "electron": "^6.0.4",
+    "electron-builder": "^21.2.0",
+    "eslint": "^6.2.2"
   },
   "repository": {
     "type": "git",